Franz carl bellinger



(No Model.) E

r F. G. BELLINGER.

STAMPING 0B. DRAWING SHEET METAL.

No. 532,355. Patented Jan. 8, 1895 Fast Fly}.

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"UNITE STATES PAT NT OFFICE.

FRANZ CARL-BELLINGER, OF FULDA, GERMANY.

STAMPING OR DRAWING SHEET METAL."

SPECIFICATION forming part of Letters Patent No. 532,355, dated January 8,1895. Application filed September 15, 1892. Serial No. 446,007. (No model.)

To aZZ whom it may concern:

Be it known that I, FRANZ CARL BELLIN- GER, a subject of the King of Prussia, and a resident of Fulda, Germany, have invented certain new and useful Improvements in Stamping or Drawing Metals, of which the following is a specification, reference being had to the accompanying drawings.

My. invention relates to the manufacture of sheet-metal ware by stamping and drawing.

The scope of the well-known method of manufacturing vessels of sheet metal especially sheet iron by means of drawing-presses is widened by my said invention, inasmuch as the process of drawing is extended to vessels having double walls.

The improved method consists inthat the drawing takes place, not only to one side or in one direction, but also rearwardly in the opposite direction to the first, thereby enabling vessels with double walls to be pro- I V duced. For this purpose I use a special stamping mold which will hereinafter be specified.

By way of example I will proceed to describe the several stages in the manufacture of vessels having double walls with reference to'the accompanying drawings.

Figures 1 m8 show the various transition forms at the several stages of manufacture of the vessel illustrated in Fig. 9 and representing a cake-mold.

For making such avessel as shown in Fig. 9, having double Walls m, n I first stamp a vessel of the form shown in Fig. 1 from sheet metal in the well-known manner, and then deepen it according to Fig. 2 in another drawing-press stamp. Fig. 3 shows how the Ves- 'sel is further deepened, the deepened part being made of a smaller diameter. In Fig. 4 the deepening is carried still further the diameter being reduced each time.

So far the manufacture of the vessel according .to Fig. 4 having a single wall has not heretofore presented special difficulties. The novel feature of my invention consists however more especially in the transformation of the vessel Fig. 4 obtained in'this manner into that represented in Fig. 5. With this object I now deepen the bottom of the vessel, not in the same but in the opposite direction, the diameter being further diminished. Figs. 6, 7 and 8 show'the continuation of this deep ening in the reverse direction the diameters being at each successive stage reduced so as to correspond roughly with the final forms to be obtained. From the form of the vessel Fig. 8 the form Fig. 9 is then very easily producedq It will be observed that according to my invention-a deep cup-shaped article of sheet metal is produced by drawing a blank of thin sheet metal into a cup having gradually broken and gradually deeper intermissions, which cup is'placed on a die in an inverted position, and the bottom drawn into a cup having gradually broken and gradually deeper intermissions, the cup being finally drawh in dies with smooth surfaces, for the purpose of producing a vessel with double walls located close to one another.

\Vhat I claim isn The method of making deep cup-shaped articles of sheet metal, which consists first in drawing a blank of thin sheet metal into a cup with gradually broken and gradually deeper intermissions, then placing it on a die in an inverted position and reversely drawing the bottom into a cup with gradually broken and gradually deeper intermissions, and finally drawing the cup in dies with smooth surfaces, wherebya vessel is produced with double walls situated close to one another, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

FRANZ CARL BELLINGER. 

